package com.bw.controller;

import com.alibaba.fastjson.JSON;
import com.bw.entity.User;
import com.bw.mapper.UserMapper;
import org.spring.kun.common.Md5Utils;
import org.spring.kun.common.TokenUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.redis.core.RedisTemplate;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.validation.BindingResult;
import org.springframework.web.bind.annotation.RequestMapping;

import javax.servlet.http.HttpServletResponse;
import javax.validation.Valid;
import java.util.concurrent.TimeUnit;

@Controller
public class LoginController {


    @Autowired
    UserMapper userMapper;

    @Autowired
    RedisTemplate redisTemplate;


    @RequestMapping("/loginPage.do")
    public String loginPage() {


        return "login";
    }

    @RequestMapping("/login.do")
    public String login(@Valid User loginUser, BindingResult result, Model model, HttpServletResponse response) {
        if (result.hasErrors()) {

            model.addAttribute("error", result.getAllErrors().get(0).getDefaultMessage());

            return "login";
        }

        User userFromDB =  userMapper.selectByName(loginUser.getName());
        if (userFromDB == null){
            model.addAttribute("error", "用户名不存在");
            return "login";
        }
        // 密码
        String loginUserPassword = loginUser.getPassword(); // 用户输入的密码

        String salt = userFromDB.getSalt(); // 数据库里的盐
        String password = userFromDB.getPassword(); // 数据库里的密码
        String md5String = Md5Utils.getMD5String(loginUserPassword + salt);

        if (! password.equals(md5String)){
            model.addAttribute("error", "密码错误");
            return "login";
        }

        // 加密用户信息 得到令牌  把token 放入cookie  通过response 返回给浏览器
        TokenUtils.responseTokenByCookie(userFromDB,response);

        // 把用户信息放入Redis  并且要设置过期时间  30分钟
        redisTemplate.opsForValue().set("user", JSON.toJSONString(userFromDB),30, TimeUnit.MINUTES);

        return "success";
    }
}
